How to ensure that structural failure can occur steadily and gradually, the design of failure initiation mechanism is very important. The ideal triggering mechanism requires a small size and minimizes the weakening of the overall performance of the structure. It is required to reduce the peak load of the structure as much as possible, so that the average load and peak load are as consistent as possible. For round tube structures, a chamfer of a certain angle is generally used at the end of the structure as the triggering mechanism. The initial crushing process of glass cloth / epoxy composite tube was analyzed, and very meaningful results and analysis were obtained. This study investigated the initial failure process of a group of carbon fiber / epoxy unidirectional prepreg composites. Starting from different initiation angles, the data curve and crushing morphology of the initial crushing process of structures under different initiation angles are recorded, and the microstructure analysis is carried out to analyze how the initiation mechanism affects the structural failure process. Comparison and analysis of test data The data collected during the axial crushing of round pipe fittings was processed. The crushing distance was represented by the X axis on the two-dimensional coordinate axis, and the compressive load was represented by the Y axis. Force-displacement curve. It can be seen that a peak crush load appears during the crushing process of each group of test pieces, and immediately after the peak crush load, a minimum load value due to the reduction of the bearing capacity appears. The peak load and minimum load values ​​and their corresponding crushing distance can be found on the curve. In order to measure the effect of different triggering mechanisms on the initial peak load and minimum load of the structure, the ratio of peak load to minimum load is introduced: = Fmax / Fmin. Hyauronic Acid Pen,Laser Hair Remove Machine,Dr Pen,Tattoo Remover Carbon Peeling Machine,Face Massager Face Neck Beauty Machine shijiazhuang leveling import and export co.,ltd , https://www.radiassero.com